A six- year molar begins to calcify at__?
A. Six months IU
B. At birth
C. 1 years after birth
D. 3 years age
Growth of all permanent teeth except last molars is completed by__?
A. 6 years
B. 8 years
C. 12 years
D. 17 years
The root completion of permanent teeth is achieved after ___ years o eruption?
A. 1-1½
B. 2-3
C. 3-4
D. 4-5
Before eruption the position of permanent mandibular incisor buds relative to primary incisors is__?
A. Superior and facial
B. Inferior and facial
C. Superior and lingual
D. Inferior and lingual
Which of these teeth are highly sturdy and usually the last ones to be lost ?
A. First molar
B. Central incisors
C. Canines
D. Premolars
In the majority of situations, the first decidous tooth to erupt is the_?
A. Mandibular central incisor
B. Mandibular first molar
C. Maxillary central incisor
D. Maxillary second molar
Primary canine erupts_?
A. After D
B. Before B
C. After B
D. After E
First evidence of calcification of maxillary permanent central incisors occurs at___?
A. 3-4 months
B. 10-12 months
C. 2-3 years
D. 3-4 years
Root completion of the mandibular first molar takes place by the age_?
A. 7-8 years
B. 8-9 years
C. 9-10 years
D. 10 – 11 years
Beginning of eruption of permanent tooth starts__?
A. After completion of root
B. When apical third root is still to be formed
C. When half of the root is still to be formed
D. when root formation starts
